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Shiny Cowbird

Molothrus bonariensis
(Gmelin, JF, 1789)
Tordo Renegrido
Chupim

Family: Icteridae
Order: Passeriformes
Class: Aves
Phylum / Division: Chordata
Kingdom: Animalia

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Conservation status according to BirdLife International: Least Concern

Description: It is a medium-sized bird with a robust build and upright posture, showing clear sexual dimorphism. The male displays glossy black plumage with bluish or purplish iridescence, while the female is much duller, with brownish to grayish tones and fine streaking. The bill is short, strong, and conical, suited to a varied diet, and the dark eyes give it an alert expression.

Geographic distribution: It is widely distributed throughout South America, with natural and human-facilitated expansion into Central America and parts of the Caribbean. It is one of the most widespread species within its genus.

Habitat: It primarily inhabits open and semi-open environments, such as grasslands, farmland, rural areas, city outskirts, and urban parks. Its high tolerance for human-altered landscapes has greatly contributed to its geographic expansion.

Feeding: This species is omnivorous, feeding mainly on seeds, grains, and small invertebrates such as insects and larvae. It often forages on the ground, alone or in groups, frequently taking advantage of resources associated with livestock and agriculture.

Behavior: It is a gregarious and opportunistic species, commonly seen in flocks, especially outside the breeding season. It shows confident and adaptable behavior, often frequenting areas with intense human activity. During reproduction, females exhibit particularly stealthy behavior.

Nesting: It has a distinctive reproductive strategy known as brood parasitism, as it does not build its own nest. Females lay their eggs in the nests of other bird species, which then incubate the eggs and raise the chicks. The young often grow rapidly and may outcompete or displace the host’s offspring.

Conservation status: It is classified as Least Concern, due to its wide distribution, large population size, and strong adaptability. No significant global threats are currently identified.


Author of this compilation: EcoRegistros – 22/12/2025




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Last published photographs

Foto
Photography ID: 681749
  Adult

El Trapiche
San Luis
Argentina
11/15/2024
Gustavo Abel Larracoechea
Foto
Photography ID: 671590
  Adult

Lujan
San Luis
Argentina
12/31/2024
Hugo Alberto Valderrey
Foto
Photography ID: 657516
  Adult

Parque Nacional Copo
Santiago del Estero
Argentina
10/12/2024
Gustavo Cecconi
Foto
Photography ID: 637922
  Juvenile

Berisso
Buenos Aires
Argentina
12/26/2024
Julian Uriel Collado
Foto
Photography ID: 631974
  Adult

Jaén
Cajamarca
Peru
07/15/2024
Jorge Schlemmer
Foto
Photography ID: 627724
  Adult

Corrientes
Corrientes
Argentina
08/25/2024
Esteban Geronimo Javier Luque
Foto
Photography ID: 624618
  Adult

Mar del Plata
Buenos Aires
Argentina
11/30/2024
José Luis Ianiro
Foto
Photography ID: 622926
  Adult

Choele Choel
Río Negro
Argentina
11/29/2024
Ariel Alejandro Vazquez
Foto
Photography ID: 622925
  Adult

Choele Choel
Río Negro
Argentina
11/29/2024
Ariel Alejandro Vazquez



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 Detail of places sorted by number of records








Page 1
Record IDDateExact timeCountryProvince / departmentPlaceFilmedPhotographedRecorded vocalObservedHeardWounded or deadNumber of individualsUser or BibliographyDetail
242854031/12/2024ArgentinaSan LuisDique lujan, LujanHugo Alberto Valderrey
222915531/12/2024UruguayMaldonadoPunta de este3Gabriel Carbajales
222792731/12/2024ArgentinaBuenos AiresHudson1Pablo Richter
222937530/12/2024ArgentinaCatamarcaTúneles de La Merced, La MercedFabrizio García
222773930/12/2024ArgentinaBuenos AiresDeán Funes 499-573, Bernal4Pablo Richter
222934429/12/2024ArgentinaCatamarcaLas HiguerillasFabrizio García
222828729/12/2024ArgentinaSantiago del EsteroEcocamping - Laguna cantera municipal, Pinto6Rodolfo Domnanovich
222757829/12/2024UruguayMaldonadoPunta del Este., Maldonado3Gabriel Carbajales
222753529/12/2024UruguayMaldonadoLaguna del Diario, Laguna del Diario1Gabriel Carbajales
222727229/12/2024ArgentinaEntre RíosVilla Zorraquin, Concordia18Pablo Bruni
Page 1

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Citation recommended:

EcoRegistros. 2026. Shiny Cowbird (Molothrus bonariensis) - Species sheet. Acceded from https://www.ecoregistros.org on 19/04/2026.